Voltage-controlled variable gain amplifiers

NATIONAL Semiconductor, represented by Arrow , has announced three new variable gain amplifiers (VGA) designed as higher-performance substitutes for the company's Comlinear (CLC) line of amplifiers.

These products are suitable for use in applications such as professional and consumer video equipment, high-speed digital subscriber line (DSL) modems and cellular base stations, displays, as well as instrumentation, test and medical systems.

Utilising the VIP10 process technology, National has developed a high-speed, power-efficient, good performance amplifier.

Additionally, the amplifiers provide accurate device-to-device gain matching (less than ±0.7dB) and an attenuation range of >70dB, making them suitable for automatic gain control applications in the communication, industrial and video markets.

Pin-for-pin replacements for the CLC520/522/5523, the LMH6502/6503 consumes approximately 300mW with a speed of 130MHz, and the LMH6504 consumes 100mW with a speed of 150MHz.

The LMH6502/6503 accepts a differential input and the LMH6504 is single-ended. While the gain control is linear in dB for a large portion of the total gain range for the LMH6502 and LMH6504, the LMH6503 is linear in V/V.

National's new amplifiers are based upon the VIP10 process. The VIP10 is a high speed, dielectrically isolated, complementary bipolar IC process that utilises deep trench technology on a bonded wafer for complete dielectric isolation and optimal high-speed amplifier performance.

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